Wireless Hybrid Mode Locked Lasers for Next Generation Radio-Over-Fiber Systems

Khawaja, Bilal A.; Cryan, MJ

doi:10.1109/jlt.2010.2050461

Cited by 24 publications

(28 citation statements)

References 39 publications

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“…In the second method, a PMLLD with repetition frequency of 60 GHz is used in order to generate 60 GHz carrier signal. PMLLD has been demonstrated for low-cost generation of MMW signals in the RoF communication systems [11], [12] and [13]. In the presented RoF system, an envelope detector (ED) is used for down-converting the MMW signal to intermediate frequency (IF) so that the phase noise impact on EVM results can be eliminated [14].…”

Section: Introductionmentioning

confidence: 99%

Impact of Amplitude Noise in Millimeter-Wave Radio-Over-Fiber Systems

Khayatzadeh

Elwan

Poëtte

et al. 2015

J. Lightwave Technol.

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In this paper, a complete theoretical and experimental study of amplitude noise impact on performance of radio-overfiber (RoF) communication system in millimeter-wave (MMW) frequency band is presented. A simulation method is also presented, using which one can determine the origin of the amplitude noise which has the most impact on error vector magnitude (EVM). This method is based on analyzing the trends of EVM versus received optical power. The impact of different optical and electrical noise such as relative intensity noise, shot noise and thermal noise on EVM is precisely studied employing experimental and theoretical analysis. In the proposed RoF system, two techniques are used to generate MMW signal, and the EVM results are compared from amplitude noise viewpoint. In the first technique, two independent distributed feedback lasers are used to generate MMW signal at the output of a photodetector, and the second technique is based on a passively mode-locked laser diode. Impact of optical sources phase noise on performance of the system is removed using a noncoherent down-conversion method based on envelope detector. Using this method, a very good matching between the experimental and the simulation results is observed.Index Terms-Distributed feedback (DFB) laser, envelope detector, error vector magnitude (EVM), millimeter wave (MMW), passively mode-locked laser diode (PMLLD), phase noise, radioover-fiber (RoF), relative intensity noise (RIN), shot noise.

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Section: Introductionmentioning

confidence: 99%

Impact of Amplitude Noise in Millimeter-Wave Radio-Over-Fiber Systems

Khayatzadeh

Elwan

Poëtte

et al. 2015

J. Lightwave Technol.

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“…This article extends the idea of modular integration of a planar antenna with a separately mounted MLL [ 6, 7] and demonstrates for the first time the hybrid integration of a planar antenna with a 40‐GHz MLL to produce a highly integrated low‐cost module. Forty giga hertz is being used here as a prototype frequency, because MLLs are currently not widely available at 60 GHz.…”

Section: Introductionmentioning

confidence: 77%

“…The term refers to the ability of a vector network analyzer (VNA), used to measure the impedance, to move its reference plane, such that the phase shift introduced by connectors and microstrip transmission lines can be removed. The MLL is mounted on a brass fixture [6, 7] that includes bond wires for SA section and ground connections; thus, any impedance measurement will also include these parasitic effects. Care has been taken to reduce these effects to a minimum.…”

Section: Input Impedance and Mll‐antenna Integration/mounting Confmentioning

confidence: 99%

“…The device described here is for use at the remote end of a high data rate link and forms the uplink from the remote base station to the central site. The mode‐locked lasers (MLLs) can be used in a wireless hybrid mode‐locking configuration [6] where by incoming modulated mm‐wave carrier signals from the user laptop can be locked to the internally generated mm‐wave carrier within the MLL. This results in the data being superimposed on the optical signal and removes the need for high‐cost external modulators.…”

Section: Introductionmentioning

confidence: 99%

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Millimeter‐wave photonic active integrated antennas using hybrid mode‐locked lasers

Khawaja

Cryan

2012

Micro & Optical Tech Letters

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This article introduces a novel low‐cost scheme for implementing in‐building/campus wide remote antenna units for next generation radio‐over‐fiber systems using the photonic active integrated antenna concept, whereby photonic devices can be integrated directly with planar antennas. De‐embedded input impedance of a state‐of‐the‐art 40‐GHz mode‐locked laser is measured, and the device is matched directly to the nonradiating edge of a rectangular‐microstrip‐patch antenna. Wireless hybrid mode locking is then demonstrated for a maximum wireless range of 15 cm. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1200–1203, 2012

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“…For the generation of two optical modes with mode-spacing around 60 GHz, several methods have been presented in recent years. One of the approaches is by using mode locked lasers (MLLs) [7,8]. Although the device is simple and compact, it inevitably suffers from the problems of cavity length control and tunability.…”

Section: Introductionmentioning

confidence: 99%

Widely Tunable Amplified Feedback Laser With Beating-Frequency Covering 60-GHz Band

Pan

Zhang

et al. 2015

IEEE Photon. Technol. Lett.

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A monolithic integrated amplified feedback laser is experimentally demonstrated as a new solution to generate dual-mode lasing with a wide frequency tuning range covering the entire 60-GHz band. This laser consists of a complex-coupled distributed feedback laser (DFB) and an integrated feedback cavity formed by a phase section and an amplifier section. Different laser sections are integrated by a simple quantum well intermixing (QWI) technique. By tuning the injection currents of the laser sections, the beating-frequency can be continuously tuned from 46.8 to 72 GHz with a 3-dB linewidth below 5 MHz. Benefit from the simple fabrication process and wide tuning range, the device will be a potential candidate for hybrid fiber-wireless access network and high frequency optical microwave generation.Index Terms-Millimeter-wave generation, Dual-mode Laser, Radio-over-fiber.

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Wireless Hybrid Mode Locked Lasers for Next Generation Radio-Over-Fiber Systems

Cited by 24 publications

References 39 publications

Impact of Amplitude Noise in Millimeter-Wave Radio-Over-Fiber Systems

Impact of Amplitude Noise in Millimeter-Wave Radio-Over-Fiber Systems

Millimeter‐wave photonic active integrated antennas using hybrid mode‐locked lasers

Widely Tunable Amplified Feedback Laser With Beating-Frequency Covering 60-GHz Band

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